Adjustable punching device

ABSTRACT

An adjustable punching device includes a base having a first through hole, a second through hole, a third through hole and a fourth through hole with predetermined separation, a first clamping section and a second clamping section adjacent to the third through hole and the fourth through hole. A fixed knife rack is arranged on each side of the base. The knife for each knife rack is corresponding to the first through hole and the second through hole. A lateral panel is arranged on outer side of the fixed knife rack. A pressing plate is pivotally connected between the lateral panels. A movable knife stage is arranged between two fixed knife racks. The movable knife stage is limited between the first clamping sections and on the second clamping sections. The movable knife rack is corresponding to the third through hole and the fourth through hole. After the hole separation has been adjusted, the pressing plate is pressed to punch holes with fixed separation.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a punching device, especially to an adjustable punching device.

2. Description of Prior Art

The prior art punching device generally includes a base, two through holes defined on the base, two knife stages arranged on the base and corresponding to the through holes, and a pressing plate pivotally arranged on the base and corresponding to the knifes. When the pressing plate is pushed down to press on the top of the knife, the knife is also pushed downward on the through holes. Therefore, two holes can be made with predetermined separation on paper.

The above-mentioned punching device can punch two holes with predetermined separation on paper. However, when user wants to punch additional two or three holes, the third hole might have different separation with the other two holes. It is not suitable for practical use. The user is forced to buy a punching device for three holes. It is not convenient for user.

SUMMARY OF THE INVENTION

The present invention is intended to provide a punching device with new design, which allows user to punch holes with equal separation after the hole separation is set.

Accordingly, the present invention provides an adjustable punching device, which includes a base having a first through hole, a second through hole, a third through hole and a fourth through hole with predetermined separation, a first clamping section and a second clamping section adjacent to the third through hole and the fourth through hole. A fixed knife rack is arranged on each side of the base. The knife for each knife rack is corresponding to the first through hole and the second through hole. A lateral panel is arranged on outer side of the fixed knife rack. A pressing plate is pivotally connected between the lateral panels. A movable knife stage is arranged between two fixed knife racks. The movable knife stage is limited between the first clamping sections and on the second clamping sections. The movable knife rack is corresponding to the third through hole and the fourth through hole. After the hole separation has been adjusted, the pressing plate is pressed to punch holes with fixed separation.

BRIEF DESCRIPTION OF DRAWING

The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:

FIG. 1 shows an exploded view of the present invention.

FIG. 2 shows a perspective view of the present invention.

FIG. 3 shows a top view of the present invention.

FIG. 4 is a view showing the adjustment of the movable knife stage according to the present invention.

FIG. 5 is another view showing the adjustment of the movable knife stage according to the present invention.

FIG. 6 is still another view showing the adjustment of the movable knife stage according to the present invention.

FIG. 7 is still another view showing the adjustment of the movable knife stage according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1 and 2, the present invention provides an adjustable punching device, which includes a base 1, a movable knife stage 2 and a pressing plate 3.

The stage 1 includes a first through hole 11 and a second through hole 12 on both sides thereof. A third through hole 13 and a fourth through hole 14 with predetermined separation are provided between the first through hole 11 and the second through hole 12. First camping section 15, 15 a and second camping sections 16, 16 a are provided beside the third through hole 13 and the fourth through hole 14. The first camping section 15, 15 a are blocks to limit the movement of the knife stage 2, and the second camping sections 16, 16 a are projections to clamp the knife stage 2. Two fixed knife racks 17, 17 a are arranged on both sides of the base 1 and each of the fixed knife racks 17, 17 a is provided with a spring element 171, 171 a. The spring elements 171, 171 a are capped on the knifes 172, 172 a corresponding to the first through hole 11 and the second through hole 12. Lateral panels 18, 18 a are provided outside the fixed knife racks 17, 17 a and include coupling holes 181, 181 a for pivotally connecting to the pressing plate 3. A lower cover 19 is provided below the base 1 and includes an adjustable positioning rod 191.

The movable knife stage 2 is arranged between the fixed knife racks 17, 17 a and is fixed to the base 1 by screwing a screw unit 21 with a nut 22 and a tab 23, where the screw unit 21 passes a pivotal hole 20. A knife 25 with a spring element 24 is provided in the movable knife stage 2. Clamping holes 26 corresponding to the second camping sections 16, 16 a are defined on bottom of the movable knife stage 2. After the position of the movable knife stage 2 is adjusted, the clamping holes 26 can be posited corresponding to the second camping sections 16, 16 a and the knife 25 is corresponding to the third through hole 13 or the fourth through hole 14.

The pressing plate 3 includes holes 31, 31 a corresponding to the coupling holes 181, 181 a of the lateral panels 18, 18 a. A pivotal unit 32 passes the holes 31, 31 a such that the pressing plate 3 is pivotally connected to the lateral panels 18, 18 a. The pressing plate 3 includes a pressing section 33 for pressing against top of the knifes 172, 172 a, 25, where the pressing section 33 has one convex face and a concave face.

With reference to FIGS. 3, 4 and 5, the operation of punching three holes by the adjustable punching device of the present invention is demonstrated. The movable knife stage 2 is moved toward one side. After the movable knife stage 2 is blocked by the first camping section 15, the clamping hole 26 of the movable knife stage 2 is clamped to the second camping section 16. Therefore, the knife 25 of the movable knife stage 2 is corresponding to the third through hole 13. At this time, user places paper 5 in the gap 4 between the base 1 and the two fixed knife racks 17, 17 a and the movable knife stage 2 and the presses the pressing plate 3. The pressing section 33 is placed atop the knifes 172, 172 a and 25 and then the knifes 172, 172 a and 25 are pressed downward to punch three holes with equal separation on the paper 5.

FIGS. 6 and 7 show the adjustable punching device according to another preferred embodiment of the present invention, where the adjustable punching device is used to punch additional two holes with equal separation. The adjustable positioning rod 191 is moved to a position with reference to size of the paper 5 and then the movable knife stage 2 is moved to another side. The movable knife stage 2 is then stopped by the first camping section 15 a. The clamping hole 26 of the movable knife stage 2 is clamped to the second clamping section 16 a such that the knife 25 of the movable knife stage 2 is corresponding to the fourth through hole 14. At this time, user places the paper 5 in the gap 4 between the base 1 and the two fixed knife racks 17, 17 a and the movable knife stage 2 and the presses the pressing plate 3. The pressing section 33 is placed atop the knifes 172, 172 a and 25 and then the knifes 172, 172 a and 25 are pressed downward to punch two holes with equal separation on the paper 5.

More particularly, the movable knife stage 2 according to the present invention can be applied to any punching device for punching more than two holes, whereby user can punch multiple holes with equal separation.

Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims. 

1. An adjustable punching device, comprising: a base comprising a first through hole and a second through hole on both sides thereof, and a third through hole and a fourth through hole between the first through hole and the second through hole and having different separation, two first clamping sections and two second clamping sections being arranged beside the third through hole and the fourth through hole, two fixed knife racks being arranged on two side of the base, wherein the two fixed knife racks being corresponding to the first through hole and the second through hole, a lateral panel being arranged outside of each of the fixed knife racks; a movable knife stage pivotally connected to the base and placed between the two fixed knife racks, one side of the movable knife stage being in contact with the one of the first clamping section, a clamping hole on a bottom of the movable knife stage being clamped to one of the second clamping section, the movable knife stage being corresponding to the third through hole or the fourth through hole after the movable knife stage being clamped to the first clamping section and the second clamping section; and a pressing plate pivotally connected between the two lateral panels and placed atop the two fixed knife racks and the movable knife stage.
 2. The adjustable punching device as in claim 1, wherein each of the two fixed knife racks comprises a knife corresponding to the first and second through hole, a spring element being provided for the knife.
 3. The adjustable punching device as in claim 1, wherein a lower cover is provided below the base and comprises an adjustable positioning rod.
 4. The adjustable punching device as in claim 1, wherein the first clamping section is a block baffling any side of the movable knife stage.
 5. The adjustable punching device as in claim 1, wherein the second clamping section is a projection positioning at bottom of the movable knife stage.
 6. The adjustable punching device as in claim 1, wherein each of the two lateral panels comprises a coupling hole.
 7. The adjustable punching device as in claim 1, wherein the movable knife stage comprises a knife and a spring element is provided for the knife.
 8. The adjustable punching device as in claim 1, wherein the pressing plate comprises holes on both sides and corresponding to the coupling hole, a pivotal unit passes the holes such that the pressing plate is pivotally connected to the lateral panels.
 9. The adjustable punching device as in claim 1, wherein the pressing plate comprises a pressing section for pressing against top of the knifes, where the pressing section has one convex face and a concave face. 